A kind of cobalt, the method for ammonia catalysis thiosulfate leaching gold

A technology of thiosulfate and sulfosulfate, which is applied in the field of hydrometallurgy, can solve the problems of large leaching agent consumption, slow gold leaching speed, and poor gold leaching effect, and achieve simple leaching liquid components, easy recovery, and low consumption. volume effect

Active Publication Date: 2017-09-29
CENT SOUTH UNIV
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  • Application Information

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Problems solved by technology

But it has three major defects: (1) cyanide is highly toxic; (2) the gold leaching effect on refractory gold ores is poor, and more than one-third of my country's gold ore resources are refractory ores; (3) gold leaching speed slow
[0007] In order to solve the problem of large consumption of leaching agent existing in current thiosulfate method for leaching gold, the present invention is specially proposed

Method used

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  • A kind of cobalt, the method for ammonia catalysis thiosulfate leaching gold
  • A kind of cobalt, the method for ammonia catalysis thiosulfate leaching gold
  • A kind of cobalt, the method for ammonia catalysis thiosulfate leaching gold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: In the pulp as described in Comparative Example 1, add cobalt sulfate, ammonia water, and sodium thiosulfate to 0.01mol / L, 0.3mol / L, and 0.1mol / L successively, and then adjust the pulp with sodium hydroxide pH is 9.0, and other leaching conditions are leached for 4.0h under the same conditions as in Comparative Example 1, the leaching rate of gold is 89.1%, and the consumption of sodium thiosulfate is 5.26kg / t 原料 .

Embodiment 2

[0027] Embodiment 2: In the pulp as described in Comparative Example 1, add cobalt sulfate, ammoniacal liquor, sodium thiosulfate respectively to 0.03mol / L, 0.7mol / L, 0.5mol / L successively, then adjust the pulp with sodium hydroxide The pH is 10.0, and other leaching conditions are leached for 8.0h under the same conditions as that of Comparative Example 1, the leaching rate of gold is 90.9%, and the consumption of sodium thiosulfate is 5.76kg / t 原料 .

Embodiment 3

[0028] Embodiment 3: In the ore pulp as described in Comparative Example 1, add cobalt sulfate, ammoniacal liquor, ammonium thiosulfate respectively to 0.05mol / L, 1.0mol / L, 1.0mol / L successively, then adjust the ore pulp with sodium hydroxide pH is 11.0, and other leaching conditions are leached for 12.0h under the same conditions as in Comparative Example 1, the leaching rate of gold is 91.8%, and the consumption of ammonium thiosulfate is 7.24kg / t 原料 .

[0029] Raw material condition 2: The raw material is calcined sand obtained by oxidizing and roasting a certain high-sulfur and high-arsenic gold concentrate. %, 0.55%, 0.25%, 0.24%, 0.09%. Its mineral composition is mainly hematite and quartz. Table 2 is the gold chemical phase analysis results of the calcine.

[0030] Table 2 Chemical phase analysis results of gold in calcine

[0031]

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Abstract

The invention provides a new method for leaching gold by thiosulfate through cobalt and ammonia catalysis. The cobalt and ammonia catalysis is adopted to replace traditional copper and ammonia catalysis, that is, cobalt sulfate is added in thiosulfate gold leaching pulp to replace the adding of copper sulfate. As the thiosulfate method has such advantages as gold leaching in an alkaline medium, no poison of a leaching agent and low cost, the thiosulfate method is extensively considered as a most growable non-cyaniding gold leaching method. However, a traditional thiosulfate gold leaching method has the problem of high leaching agent consumption, and badly hinders the industrial application. The method eliminates the oxygenolysis effect of Cu(NH3)4<2+> on S2O3<2->, can prominently reduce the consumption of thiosulfate, and has equivalent gold leaching rate compared with the copper and ammonia catalysis. The method is helpful to promote industrial application of gold leaching by the thiosulfate method.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a cobalt and ammonia catalyzed thiosulfate gold leaching method. Background technique [0002] The cyanidation method has long occupied a dominant position in the gold extraction industry due to its mature technology and simple process. But it has three major defects: (1) cyanide is highly toxic; (2) the gold leaching effect on refractory gold ores is poor, and more than one-third of my country's gold ore resources are refractory ores; (3) gold leaching speed slow. Therefore, the development of non-cyanidation gold leaching technology is of great significance. The thiosulfate method in the non-cyanide technology has the advantages of non-toxic and cheap leaching agent, fast gold leaching speed, and less corrosion of equipment by leaching gold in alkaline media, so it is widely considered to be the most potential non-cyanide method. method. With the increasing emphasis ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00C22B3/14
CPCC22B3/14C22B11/04Y02P10/20
Inventor 徐斌李骞姜涛杨永斌闵欣刘晓亮李光辉郭宇峰范晓慧张元波许斌陈许玲彭志伟甘敏杨凌志
Owner CENT SOUTH UNIV
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